常見例句Transistors have many advantages over the old-fashioned vacuumtube valves. 與老式真空管相比,晶體管具有許多優(yōu)點(diǎn)。many advantages over the old-fashioned vacuumtube valves. 與老式真空管相比，晶體管具有許多優(yōu)點(diǎn)。vacuumtube rectifier 電子管整流器oxide cathode vacuumtube 氧化物陰極電子管 返回 vacuumtube